BOULDER, Colo. (AP) — Environmental activists have filed a preliminary injunction request to keep Rocky Flats National Wildlife Refuge from opening at the site of a former nuclear weapons facility.

The Daily Camera reported Thursday that the refuge is planned for more than 7.8 square miles (20 square kilometers) and set to open in the summer.

Activists claim the refuge has not been proven to be safe for visiting members of the public.

Before seeking the injunction, activists filed a suit naming the U.S. Fish and Wildlife Service, the U.S. Federal Highway Commission and others as defendants.

State and federal officials have said a $7 billion cleanup and remediation has made the area safe for both animals and humans.

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Information from: Daily Camera, http://www.dailycamera.com/